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阀门口径分类标准 _阀门标准

    通径在各国、各行业标准中都各有解读。公称通径是一个圆整数它和实际通径不完全相同,它以不同形式的阀门和不同公称压力、不同规格尺寸来划分为缩径、不缩径及全通径、流通直径。我国按GB/T12237、GB/T12238、GB/T7746来执行。
     美国的通径划分。按美国国家标准ANSI.B16.1;美国工程师协会ASME.B16.34;美国石油协会AP16D;标准以不同的压力规定不缩径的最小流通直径。
     英国的通径体系划分以BS5351规定了球阀、通孔阀和不同的压力等级划分最小流通直径。

日本的通径体系划分以JIS.2001规定了通用阀门、船用、室外下水道通用,以不同的压力等级划分流通直径,以我国标准为例。
 
There are different understandings for DN in different countries. It is an integer which is a little different from practical diameter.It is divided into reduced bore, non-reduced bore,full bore and flow diameter by different valve, nominal Preassure, spec sizes. It is carried out by GB/T12238、GB/T7746 in China.
American standard.ANSI.B16.1;ASME.B16.34;AP16D.
Inch system is applied to BS5351.
Japanese diameter system conform to JIS.2001.
 

钢制球阀阀体的最小流道直径 The Minimum Flow Diameter
(GB/T12237-1989)(mm)

公称通径
DN
Nominal Diameter

阀体的最小流道直径 The minimum Flow Diameter

缩径 Reduced Bore

不缩径 Non-Reduced Bore

公称压力/MPA
Nominal Pressure

1.6. 2.5. 4.0. 6.4.

10

10

-

9

9

15

9.5

12.5

12.5

20

12.5

17

17

25

17

24

24

32

23

30

30

40

28

37

37

50

36

49

49

65

51

64

64

80

57

75

75

100

76

98

98

文章来源:中国泵阀网

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